Management of Insect and Mite Pests in Corn
Arthropod pests of corn are varied, and often difficult to manage. Many corn pest problems can be avoided by implementing an Integrated Pest Management (IPM) plan that includes preventive pest management practices, such as selecting varieties adapted to Oklahoma growing conditions, planting at an optimal date, proper fertilization and irrigation, and using crop rotations. The application of insecticides, while sometimes necessary, should not be used as a substitute for good agronomic practices or as “preventative insurance” because it is rarely economically or environmentally justifiable.
The information herein is for educational purposes only. Reference to commercial products
or trade names is made with the understanding that no discrimination is intended and
no endorsement by the Cooperative Extension Service is implied.
Pesticide recommendations in this publication were correct as of the “Modified Date”
but always check the label that came with the purchased insecticide for the most current
rates and restrictions
The first name listed is the trade name of a product registered for use in corn for
the listed pest. The name in (parentheses) listed below the trade name is the name
of the active ingredient. The active ingredient name is provided because in many cases,
there are other registered products containing the same active ingredient that may
cost less, so producers should compare prices.
The number [in brackets] following a product is its Mode of Action number [MOA]. The
more frequently insecticides with the same MOA are used, the more likely resistance
will occur. This number provides an easy way to select different modes of action to
avoid selecting for pests that are resistant to a certain mode of action.
Refer to the following publications for additional information on corn pest management.
- EPP-7160 Field Key to Larvae in Corn
- EPP-7196 Grasshopper Management in Rangeland, Pastures, and Crops
Armyworm
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Armyworm |
Asana XL [3] (esfenvalerate) |
5.8 to 9.6 fl oz (0.03 to 0.05 lb ai/A) |
21-day waiting period |
|
1 to 1.5 inches. Dark green or brown caterpillar with five stripes along a smooth body. Head with honeycomb-like markings. |
Bacillus thuringiensis [11] (Biobit, Condor, Dipel, Lepinox, Javelin, Xentari) |
See product label for specific rates |
Check label for waiting periods. |
|
Damage: Armyworms present throughout growing season, but natural enemies have large impact on them. |
Baythroid XL [3] (beta-cyfluthrin) |
1.6 to 2.8 fl oz (0.013 to 0.022 lb ai/A) |
21-day wait for grain or fodder, 0 days for green forage. |
|
Threshold: Treat if 30% of plants (seedling to six extended leaves) are infested, or when 75% of plants are infested with one or more larvae on larger plants. |
Besiege[28,3] (chlorantraniliprole + lambda cyhalothrin) |
6.0 to 10.0 fl oz/A |
21-day waiting period. |
|
|
Blackhawk [5] (spinosad) |
1.67 to 3.3 fl oz (0.038 to 0.075 lb ai/A) |
7-day wait for forage, 28 days for grain or fodder |
|
|
Brigade 2EC [3] |
2.1 to 6.4 fl oz |
30 day wait for grazing or harvest. |
|
|
Delta Gold [3] (deltamethrin) |
1.5 to 1.9 fl oz (0.018 to 0.022 lb ai/A) |
21-day wait for harvest, 12 days for grazing or silage. |
|
|
Fastac [3] (alpha-cypermethrin) |
3.2 to 3.8 fl oz (0.020 to 0.025 lb ai/A) |
30-day wait for harvest, 60 days for grazing. |
|
|
Hero [3] (zeta-cypermethrin + (bifenthrin) |
4.0 to 10.3 fl oz |
30-day PHI for grain and stover, 60 days for forage. |
|
|
Intrepid 2F [18] (methoxyfenozide) |
4 to 16 fl oz (0.06 to 0.25 lb ai/A) |
21-day waiting period. |
|
|
Lannate LV [1A] (methomyl) |
0.75 to 1.5 pt (0.225 to 0.45 lb ai/A) |
21-day PHI for harvest, 3 days for forage. |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
3.2 to 4.0 fl oz (0.02 to 0.025 lb ai/A) |
7-day waiting for harvest. |
|
|
Pounce 25WP [3] (permethrin) |
6.4 to 9.6 oz (0.1 to 0.2 lb ai/A) |
30-day PHI period. |
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
2.56 to 3.84 fl oz (0.01 to 0.015 lb ai/A) |
21 day wait for harvest or grazing |
|
|
Radiant SC [5] (spinetoram) |
3.0 to 6.0 fl oz (0.023 to 0.047 lb ai/A) |
28-day wait for harvest, 3 days for forage or fodder. |
|
|
Sevin XLR [1A] (carbaryl) |
1 to 2 qt (1.5 to 2 lb ai/A) |
48-day wait for grain, 14 days for grazing or silage. |
|
|
Vantacor [28] |
1.2 to 2.5 fl oz |
14 day waiting period for harvest |
|
|
Warrior II with Zeon [3] |
1.28 to 1.92 fl oz |
21 days for harvest. Check label for grazing restriction |
Chinch Bug
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row |
Comments |
|---|---|---|---|
|
Chinch bug |
Seed Treatments |
|
|
|
Nymphs are bright red with white band across back. Adults ½ inch, black with white “hour glass” shape on back. |
|
|
|
|
Damage: Adults may fly into field, early (March April)or adults and nymphs move into corn from maturing wheat fields (April-May). Remove plant juices, cause stunting, wilting and reddening of leaves. |
Cruiser 5FS [4A] (thiamethoxam) |
1.13 to 3.61 fl oz /80,000 seed |
Do not feed treated seed. Generally must order through a seed dealer. |
|
Threshold: Plants are less than 6 inches: 2 or more chinch bugs on 20% of plants Plants are 6-18 inches: 10 or more chinch bugs on 75% of plants. |
Gaucho 600 [4A] (imidacloprid) |
2.7 to 6.0 fl oz/80,000 seed |
Do not feed treated seed. See label for mixing and handling instructions. Follow all label restrictions. |
|
|
Poncho 600 [4A] (clothianidin) |
1.13 to 2.26 fl oz/80,000 seed |
Do not feed treated seed. See label for mixing and handling instructions. Follow all label restrictions. |
|
|
Planting Time Applications |
|
|
|
|
Force CS [3] (tefluthrin) |
0.46 to 0.57 fl oz/1,000 ft row |
T-band application. Read label carefully for restrictions. |
|
|
Post-emergence Sprays |
|
Border sprays (30-60 ft) are often effective. Best control is obtained when insecticide is applied by ground, with nozzles directed at the base of the plants using a minimum of 20 to 30 gallons of water. |
|
|
Asana XL [3] (esfenvalerate) |
5.8 to 9.6 fl oz (0.03 to 0.05 lb ai/A) |
21-day waiting period. |
|
|
Baythroid XL [3] (beta-cyfluthrin) |
1.6 to 2.8 fl oz (0.013 to 0.022 lb ai/A) |
21-day waiting period for grain or fodder, 0 day for green forage. |
|
|
Brigade 2EC [3] (bifenthrin) |
2.1 to 6.4 fl oz |
30 -day waiting period for grain or grazing. |
|
|
Delta Gold [3] (deltamethrin) |
1.5 to 1.9 fl oz (0.018 to 0.022 lb ai/A) |
21-day wait for harvest, 12 days for grazing or silage. |
|
|
Fastac [3] (alpha-cypermethrin) |
3.2 to 3.8 fl oz (0.02 to 0.025 lb ai/A) |
30 day wait for harvest, 60 days for grazing |
|
|
Hero [3] (zeta-cypermethrin + (bifenthrin) |
4.0 to 10.3 fl oz |
30-day PHI for grain and stover, 60 days for forage |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
3.2 to 4.0 fl oz (0.02 to 0.025 lb ai/A) |
7 day waiting period for harvest
|
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
3.84 fl oz (0.015 lb ai/A) |
21-day waiting period. |
|
|
Sevin XLR [1A] (carbaryl) |
1 to 2 qt (0.5 to 1 lb ai/A) |
48 day waiting period for harvest, 14 days for grazing or silage |
|
|
Warrior II w Zeon [3] |
1.92 fl oz |
21 days for harvest. Check label for timing restrictions. |
Corn Earworm
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Corn Earworm |
Many Bt corn hybrids offer some suppression of corn earworm, but it is not recommended that corn earworm be controlled with insecticides. |
NA |
|
|
Striped robust caterpillars that range in color from green to pink to brown to black. |
|
|
|
|
Damage: Caterpillars injure ear tips, feed in whorls. Feeding damage may increase potential for aflatoxins in grain. |
|
|
|
|
Threshold: Not practical to control in field corn |
|
|
|
|
Corn rootworm (adults) |
Asana XL [3] (esfenvalerate) |
5.8 to 9.6 fl oz (0.03 to 0.05 lb ai/A) |
21-day waiting period. |
|
Small beetle, with black stripes, 12 spots, or green. |
Baythroid XL [3] (beta-cyfluthrin) |
1.6 to 2.8 fl oz (0.013 to 0.022 lb ai/A) |
21-day wait for grain or fodder, 0 day for green forage. |
|
Damage: Feed on silks. Heavy populations may interfere with pollination. |
Besiege[28,3] (chlorantraniliprole + lambda-cyhalothrin) |
6.0 to 10 fl oz |
21-day wait for harvest. |
|
Threshold: Treat if beetles are abundant (over five per plant and silks are being severely clipped) |
Brigade 2EC [3] |
2.1 to 6.4 fl oz (0.033 to 0.1 lb ai/A) |
30-day waiting period for grain or grazing. |
|
|
Delta Gold [3] (deltamethrin) |
1.5 to 1.9 fl oz (0.018 to 0.022 lb ai/A) |
21-day wait for harvest, 12 days for grazing or silage. |
|
|
Dimethoate 4E [1B] |
0.66 to 1 pt |
14-day waiting period. |
|
|
Fastac [3] (alpha-cypermethrin) |
2.7 to 3.8 fl oz (0.017 to 0.025 lb ai/A) |
30-day wait for grain, 60 days for silage. |
|
|
Hero [3] (zeta-cypermethrin + bifenthrin) |
4.0 to 10.3 fl oz |
30-day PHI for grain and stover, 60 days for forage |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
3.2 to 4.0 fl oz (0.02 to 0.025 lb ai/A) |
7 day waiting period for harvest. |
|
|
Pounce 25WP [3] (permethrin) |
6.4 to 9.6 oz (0.1 to 0.15 lb ai/A) |
30-day waiting period. |
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
2.72 to 4.0 fl oz (0.017 to 0.025 lb ai/A) |
21 day waiting period for harvest or grazing. |
|
|
Sevin XLR [1A] (carbaryl) |
2.56 to 3.84 fl oz (0.01 to 0.015 lb ai/A) |
48-day waiting period for harvest, 14 day for grazing. |
|
|
Warrior II w Zeon [3] |
1.28 to 1.92 fl oz |
21 days for harvest. Check label for grazing restrictions. |
|
|
|
|
|
|
Corn rootworm (larvae) |
Seed Treatments |
|
|
|
Thin, white worm-like larva that lives in soil. Damage is likely to occur in early part of growing season (before June 15). |
Rootworm resistant varieties |
*Transgenic seed |
*Follow company’s guidelines for providing refugia, crop rotations and other resistance management strategies. |
|
|
Cruiser 5FS [4A] (thiamethoxam) |
**5.6 fl oz/80,000 seed |
**Do not use treated seed for feed, food, or oil processing. See label for mixing and handling instructions. Follow all label restrictions. |
|
|
Poncho 600 [4A] (clothianidin) |
**5.64 fl oz/80,000 seed |
|
|
|
Force ST [3] (tefluthrin) |
3 to 4 oz/cwt seed |
Do not use treated seed for feed, food, or oil processing. Do not apply Force 3G if Force ST was used. |
|
|
Planting Time |
|
|
|
|
Aztec 2.1 G [1B,3] (tebupiromphos, cyfluthrin) |
6.7 fl oz/1,000 ft-row |
Follow manufactures’ guidelines for rates, application methods grazing and crop rotation restrictions. Rotation of insecticides during successive years is suggested. Do not make a foliar application if planting time application was made. |
|
|
Capture LFR [3] (bifenthrin) |
0.39 to 0.98 fl oz/1,000 ft-row |
|
|
|
Counter 15G [1B] (terbufos) |
6 to 8 oz/1,000 ft-row |
|
|
|
Force 3G [3] Force CS [3] (tefluthrin) |
4 to 5 oz/1,000 ft-row 0.46 to 0.57 fl oz/1,000 ft row |
T-band or in-furrow T-band or in-furrow |
|
|
Lorsban 15 G [1B] (chlorpyrifos) |
2.5 fl oz/1,000 ft-row |
T-band or in-furrow |
|
|
Proaxis 0.5 CS [3] (gamma cyhalothrin) |
8 oz/1,000 ft-row |
|
|
|
Thimet 20G [1B] (phorate) |
0.24 oz/1,000 ft-row |
|
|
|
Post Seedling-Emergence Application |
|
|
|
|
Counter 15G [1B] (terbufos) |
8 oz/1,000 ft-row |
|
|
|
Force 3G [3] (tefluthrin) |
4 to 5 oz/1,000 ft-row |
|
|
|
Thimet 20G [1B] |
4.5 to 6 oz/1000 ft row |
|
Cutworms
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Cutworms (black, granulate, sandhill) |
Seed Treatments |
|
|
|
Striped or solid colored, robust caterpillars that “roll” up when disturbed, and prefer to live under ground. |
Resistant varieties |
Transgenic seed |
Follow company’s guidelines for providing refugia, crop rotation and other resistance management strategies. |
|
Damage: Cutworms generally feed at night, and live under the soil during the day. Plants will be cut at or slightly above the soil level, causing stand reductions. |
|
|
|
|
Threshold: Scout fields at seedling emergence. Treat when worms are less than ½ inch long, and skips are noticed. |
Pre-Plant/Planting Time |
|
|
|
|
Aztec 2.1 G [1B, 3] (tebupiromphos+ cyfluthrin) |
6.7 fl oz/1,000 ft-row |
Follow manufactures’ guidelines for rates, application methods grazing and crop rotation restrictions. |
|
|
Capture 2EC [3] (bifenthrin) |
0.15 to 0.3 fl oz/1,000 ft-row |
|
|
|
Counter 15G [1B] (terbufos) |
6 to 8 oz/1,000 ft-row |
|
|
|
Force 3G [3] Force CS [3] (tefluthrin) |
4 to 5 oz./1,000 ft-row 0.46 to 0.57 fl oz/1,000 ft row |
T band or In-furrow T band or In-furrow |
|
|
Lorsban 15 G [1B] (chlorpyrifos) |
8 oz/1,000 ft-row |
T-band or In-furrow |
|
|
Proaxis 0.5 CS [3] (gamma cyhalothrin) |
0.66 oz/1,000 ft-row |
|
|
|
Pounce 1.5 G [3] (permethrin) |
8 oz/1,000 ft-row |
|
|
|
Post-emergence Sprays |
|
|
|
|
Asana XL [3] (esfenvalerate) |
5.8 to 9.6 fl oz (0.03 to 0.05 lb ai/A) |
21 day waiting period |
|
|
Baythroid XL [3] (beta-cyfluthrin) |
0.8 to 1.6 fl oz (0.007 to 0.013 lb ai/A) |
21 day wait for grain or fodder, 0 days for green forage.
|
|
|
Besiege[28,3] (chlorantraniliprole + lambda-cyhalothrin) |
5.0 to 10 fl oz |
21-day waiting period. |
|
|
Brigade 2EC [3] |
2.1 to 6.4 fl oz |
30-day wait for harvest or grazing. |
|
|
Delta Gold [3] (deltamethrin) |
1.0 to 1.5 fl oz (0.012 to 0.018 lb ai/A) |
21-day wait for harvest, 12 days for grazing or silage. |
|
|
Fastac [3] (alpha-cypermethrin) |
1.3 to 2.8 fl oz (0.008 to 0.018 lb ai/A) |
30 day wait for harvest, 60 days for grazing |
|
|
Hero [3] (zeta-cypermethrin + bifenthrin) |
2.6 to 6.1 fl oz |
30-day PHI for grain and stover, 60 days for forage |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
1.28 to 2.8 fl oz (0.008 to 0.0175 lb ai/A) |
21 day waiting period |
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
1.92 to 3.2 fl oz (0.0075 to 0.0125 lb ai/A) |
21 day waiting period for harvest or grazing |
|
|
Pounce 25W [3] (permethrin) |
6.4 to 9.6 oz (0.1 to 0.2 lb ai/A) |
30-day waiting period. |
|
|
Warrior II w Zeon [3] |
0.96 to 1.60 fl oz |
21-day for harvest. Check label for grazing restriction. |
Fall armyworm
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Fall armyworm |
Seed Treatments |
|
|
|
Large, striped, non-bristledworm up to 1.5 inches. Has a light colored, inverted “Y” on head. June-August |
Resistant varieties |
Transgenic seed |
Follow company’s guidelines for providing refugia, crop rotation and other resistance management strategies. |
|
Damage: Larvae cut holes in leaves at whorl stage, heaviest damage occurs on late corn when caterpillars tunnel into ear or ear shank. |
Post-emergence Sprays |
|
|
|
Threshold: Treat if 75% of plants are infested during whorl stage. |
Baythroid XL [3] (beta-cyfluthrin) |
2.8 fl oz (0.022 lb ai/A) |
21-day wait for grain or fodder, 0 days for green forage. |
|
|
Besiege[28,3](chlorantraniliprole + lambda-cyhalothrin) |
6.0 to 10 fl oz |
21-day wait for harvest. |
|
|
Blackhawk [5] (spinosad) |
1.67 to 3.3 fl oz (0.038 to 0.075 lb ai/A) |
7-day wait for forage, 28 days for grain or fodder |
|
|
Brigade 2EC [3] |
2.1 to 6.4 fl oz |
30-day wait for grazing or harvest. |
|
|
Delta Gold [3] (deltamethrin) |
1.5 to 1.9 fl oz (0.018-0.022 lb ai/A) |
21-day wait for harvest, 12 days for grazing or silage. |
|
|
Fastac [3] (alpha-cypermethrin) |
3.2 to 3.8 fl oz (0.020 to 0.025 lb ai/A) |
30 day wait for harvest, 60 days for grazing |
|
|
Hero [3] (zeta-cypermethrin + (bifenthrin) |
4.0 to 10.3 fl oz |
30-day PHI for grain and stover, 60 days for forage. |
|
|
Lannate LV [1A] (methomyl) |
0.75 to 1.5 pt (0.225 to 0.45 lb) |
21-day PHI for harvest, 3 days for forage |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
3.2 to 4.0 fl oz (0.02 to 0.025 lb ai/A) |
7 day waiting period for harvest |
|
|
Pounce 25 WP [3] (permethrin) |
6.4 to 9.6 fl oz (0.1 to 0.15 lb ai/A) |
30 day waiting period. |
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
2.56 to 3.84 fl oz (0.01 to 0.015 lb ai/A) |
21-day waiting period. |
|
|
Vantacor [28] |
1.2 to 2.5 fl oz |
14 day waiting period for harvest. |
|
|
Warrior II w Zeon [3] |
1.28 to 1.92 fl oz |
21-day waiting period. Check label for grazing restrictions. |
Flea Beetles
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Flea beetles |
Asana XL [3] (esfenvalerate) |
5.8 to 9.6 fl oz (0.03 to 0.05 lb ai/A) |
21-day waiting period. |
|
Shiny, black beetle about 1/16 inch that jumps when disturbed. |
|
|
|
|
Damage: Early spring-summer. Plant tissue is scraped from leaf, giving it a drought stress appearance. Can cause delayed development is cool growing conditions |
Baythroid XL [3] (beta-cyfluthrin) |
0.8 to 1.6 fl oz (0.007 to 0.013 lb ai/A) |
21-day wait for grain or fodder, 0 days for green forage. |
|
Threshold: Apply to small plants when beetles first appear and some plants are being killed. |
Besiege[28,3] (chlorantraniliprole + lambda cyhalothrin) |
6.0 to 10 fl oz |
21-day wait for harvest. |
|
|
Brigade 2EC [3] |
2.1 to 6.4 fl oz |
30 day wait for grazing or harvest |
|
|
Delta Gold [3] (deltamethrin) |
1.0 to 1.5 fl oz (0.012 to 0.018 lb ai/A) |
21 day wait for harvest, 12 days for grazing or silage |
|
|
Fastac [3] (alpha-cypermethrin) |
2.7 to 3.8 fl oz (0.017 to 0.025 lb ai/A) |
30-day wait for grain, 60 days for silage. |
|
|
Hero [3] (zeta-cypermethrin + (bifenthrin) |
2.6 to 6.1 fl oz |
30-day wait for grain and silage, 60 days for grazing. |
|
|
Lannate LV [1A] (methomyl) |
0.75 to 1.5 pt (0.225 to 0.45 lb) |
21-day PHI for harvest, 3 days for forage |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
2.72 to 4.0 fl oz (0.017 to 0.025 lb ai/A) |
30-day wait for grain and silage, 60 days for grazing. |
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
2.56 to 3.84 fl oz (0.01 to 0.015 lb ai/A) |
21-day waiting period. |
|
|
Pounce 25WP [3] (permethrin) |
6.4 to 9.6 oz (0.1 to 0.2 lb ai/A) |
30-day waiting period. |
|
|
Sevin XLR [1A] (carbaryl) |
1 to 2 qt (0.5 to 1 lb ai/A) |
48 days for grain, 14 days for forage or silage. |
|
|
Warrior II w Zeon [3] |
1.28 to 1.92 fl oz |
21 days for harvest. Check label for grazing restriction |
Grasshopper
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Grasshopper |
Asana XL [3] (esfenvalerate) |
2.9 to 5.8 fl oz (0.015 to 0.03 lb ai/A) |
21-day waiting period. |
|
1 to 2 inches, outer wings leathery, inner wings clear or colored. Enlarged hind legs designed for jumping. |
Baythroid XL [3] (beta-cyfluthrin) |
2.1 to 2.8 fl oz (0.017 to 0.022 lb ai/A) |
21-day wait for grain or fodder, 0 day for green forage. |
|
Damage: Chew leaves, leaving ragged edges, or completely chewing leaf blade. Damage emerging seed heads, causing yield loss. |
Brigade 2EC [3] |
2.1 to 6.4 fl oz |
30-day wait for grazing or harvest. |
|
Threshold: Consider treating if numbers reach 8 to 14 in the field, or 20 to 40 in field margins. |
Delta Gold [3] (deltamethrin) |
1 to 1.5 fl oz (0.012-0.018 lb ai/A) |
21-day wait for harvest; 12 days for grazing or forage. |
|
See EPP-7196, Grasshopper Management in Rangeland, Pastures, and Crops for more information. |
Fastac [3] (alpha-cypermethrin) |
2.7 to 3.8 fl oz (0.017 to 0.025 lb ai/A) |
30 day wait for harvest, 60 days for grazing |
|
|
Hero [3] (zeta-cypermethrin + bifenthrin) |
2.6 to 6.1 fl oz |
30-day PHI for grain and stover, 60 days for forage |
|
|
Karate w Zeon [3] (lambda-cyhalothrin) |
1.28 to 1.92 fl oz (0.02 to 0.03 lb ai/A) |
21-day waiting period. |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
2.72 to 4.0 fl oz (0.017 to 0.025 lb ai/A) |
7 day waiting period for harvest |
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
1.92 to 3.2 fl oz (0.0075 to 0.0125 lb ai/A) |
21-day waiting period. |
|
|
Vantacor [28] |
0.7 to 1.7 fl oz |
14 day waiting period for harvest 1 day for forage, silage, stover |
|
|
Warrior II w Zeon [3] |
1.28 to 1.92 fl oz |
21 days for harvest. Check label for grazing restriction
|
Mites
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Mites |
Capture 2EC [3] (bifenthrin) |
5.12 to 6.4 fl oz (0.08 to 0.1 lb ai/A) |
30-day waiting period. |
|
Small, less than 1/100 inch. Cause brown stippling of leaves. Banks grass and two spotted spidermites are most common pests. |
Comite II [20] (propargite) |
36 to 54 fl oz/A |
30-day waiting period. Apply when mite colonies first form, when leaves are dry. |
|
Damage: Causes stippling of leaves, severe infestations can kill leaves. Infestations generally start at lower leaves and move upward. |
Dimethoate 4E [1B] |
0.66 to 1 pt |
14-day waiting period. |
|
Threshold: Treat when there is visible damage on the lower third of the plant and small colonies are visible on the middle third of the plant, and the corn has not yet reached the hard dough stage. |
Hero [3] (zeta cypermethrin + bifenthrin) |
10.3 fl oz |
30 day wait for grain, 60 days for silage |
|
|
Oberon 2 SC [23] (spiromesifen) |
2.85 to 8.0 fl oz |
5-day PHI for green forage and silage, 30 days for grain or stover |
|
|
Onager [10A] (hexythiazox) |
10 to 24 fl oz |
30 day waiting period |
|
|
Portal [21A] (fenpyroximate) |
2 pints |
14-day waiting period. |
|
|
Zeal WDG [10B] (etoxazole) |
1.0 to 3.0 oz (0.045 to 0.135 lb ai/A) |
* for seed production only, 21-day waiting period. |
|
|
|
|
NOTE: Treatments at hard-dough stage or later are not cost effective. When heavy infestations occur, erratic control will usually be the rule. Thorough coverage is important, higher volumes (2 to 3 gallons or more per acre) when applied by aircraft increase the effectiveness of the spray. |
Seedcorn maggot, Seed corn beetle
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Seedcorn maggot, Seed corn beetle |
Seed Treatments |
|
Follow manufactures’ guidelines for rates, application methods grazing and crop rotation restrictions. Rotation of insecticides during successive years is suggested. |
|
Maggots are yellowish-white, tapered larvae about 1/4 inch. Beetles are about 3/8 inch, with two black stripes on brown wing covers. |
Poncho 600 [4A] |
0.56 to 3.61 fl oz /80,000 seed |
|
|
Damage: Damage occurs in spring, especially if soils are cool and moist and seeds are not germinating rapidly. Damage is noticed as skips in plant stands. Seed will be hollowed out. |
Poncho 600 [4A] |
1.13 to 2.26 fl oz/80,000 seed |
|
|
Threshold: Replanting is the only recourse if damage has already occurred. Use a planting-time treatment if fields have a history. No-till fields may be more vulnerable to attack. |
Force ST [3](tefluthrin) |
3 to 4 oz/cwt seed |
|
|
|
Planting Time |
|
|
|
|
Aztec 2.1 G [1B,3] (tebupiromphos, cyfluthrin) |
6.7 fl oz/1,000 ft-row |
|
|
|
Capture LFR [3] (befenthrin) |
0.2 to 0.78 fl oz/1,000 ft-row |
Seed corn beetle only. |
|
|
Counter 15G [1B] (terbufos) |
0.2 to 0.78 fl oz/1000 ft-row |
T-band or in-furrow |
|
|
Force 3G [3] (tefluthrin) |
4 to 5 oz/1,000 ft-row |
T-band or In-furrow. |
Southwestern corn borer
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Southwestern corn borer |
Seed Treatments |
|
|
|
Full grown caterpillars are white with prominent dark spots on body. Eggs are laid in masses of 12 to 30. They overlap like egg scales. Eggs are white when first laid, then red bands appear before they hatch. |
Resistant varieties |
Transgenic seed |
Follow company’s guidelines for providing refugia, crop rotation and other resistance management strategies. |
|
Damage: First generation causes “dead heart” in plants. Second generation tunnels throughout stalk. May girdle mature stalks causing lodging. |
Post-emergence Sprays |
|
|
|
Threshold:Threshold based on egg masses. Treat if 25% of plants have egg masses or newly hatched larvae. A repeat application may be needed in 7 to 10 days. |
Baythroid XL [3] (beta-cyfluthrin) |
1.6 to 2.8 fl oz(0.013 to 0.022 lb ai/A) |
21-day wait for grain or fodder, 0 days for green forage. |
|
|
Besiege[28,3] (chlorantraniliprole + lambda-cyhalothrin) |
6.0 to 10 fl oz |
21-day wait for harvest. |
|
|
Blackhawk [5] (spinosad) |
2.2 to 3.3 fl oz (0.05 to 0.075 lb ai/A) |
7-day wait for forage, 28 days for grain or fodder |
|
|
Brigade 2EC [3] |
2.6 to 6.4 fl oz |
30-day waiting period for grazing or harvest. |
|
|
Delta Gold [3] (deltamethrin) |
1.5 to 1.9 fl oz (0.018 to 0.022 lb ai/A) |
21-day wait for harvest; 12 days for forage or grazing. |
|
|
Fastac [3] (alpha-cypermethrin) |
2.7 to 3.8 fl oz (0.017 to 0.025 lb ai/A) |
30-day wait for grain, 60 days for silage. |
|
|
Intrepid 2F [18] (methoxyfenozide) |
4 to 16 fl oz (0.06 to 0.25 lb ai/A) |
21-day waiting period. |
|
|
Karate w Zeon (lambda cyhalothrin) |
1.28 to 1.92 fl oz (0.02 to 0.03 lb ai/A) |
35-day waiting period. |
|
|
Hero [3] (zeta-cypermethrin + (bifenthrin) |
4.0 to 10.3 fl oz |
30-day PHI for grain and stover, 60 days for forage |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
2.72 to 4.0 fl oz (0.017 to 0.025 lb ai/A) |
7 day waiting period for harvest. |
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
2.56 to 3.84 fl oz (0.01 to 0.015 lb ai/A) |
21-day waiting period. |
|
|
Radiant SC [5] (spinetoram) |
3.0 to 6.0 fl oz (0.023 to 0.047 lb ai/A) |
28-day wait for harvest, 3 days for forage or fodder. |
|
|
Vantacor [28] |
1.2 to 2.5 fl oz |
14 day waiting period for harvest |
|
|
Warrior II w Zeon [3] |
1.28 to 1.92 fl oz |
21 days for harvest. Check label for grazing restriction. |
Western bean cutworm
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Western bean cutworm |
Seed Treatments |
|
|
|
Larvae are dark brown with faint diamond-shaped markings on their backs. Measure 1.5 inches. Eggs are deposited in masses of 4 to 200 on upper surface of leaves. |
Resistant varieties |
Transgenic seed |
Follow company’s guidelines for providing refugia, crop rotation and other resistance management strategies. |
|
Damage: Larvae feed on developing tassel, or silk. They feed on developing kernels once the ear has formed. |
Post-emergence Sprays |
|
|
|
Threshold: Treat of eight percent or more of the plants have egg masses or small larvae in the tassels and the crop is 95% tasseled. |
|
|
|
|
|
Asana XL [3] (esfenvalerate) |
2.9 to 5.8 fl oz (0.015 to 0.03 lb ai/A) |
21-day waiting period. |
|
|
Baythroid XL [3] (beta-cyfluthrin) |
1.6 to 2.8 fl oz (0.013 to 0.022 lb ai/A) |
21-day waiting period for grain or fodder, 0 days for green forage. |
|
|
Besiege [28,3] (chlorantraniliprole + lambda-cyhalothrin) |
5.0 to 10 fl oz |
21-day wait for harvest. |
|
|
Blackhawk [5] (spinosad) |
2.2 to 3.3 fl oz (0.05 to 0.075 lb ai/A) |
7-day wait for forage, 28 days for grain or fodder. |
|
|
Brigade 2EC [3] |
2.6 to 6.4 fl oz |
30-day wait for grazing or harvest. |
|
|
Fastac [3] (alpha-cypermethrin) |
1.8 to 3.8 fl oz (0.011 to 0.025 lb ai/A) |
30 day wait for harvest, 60 days for grazing. |
|
|
Intrepid 2F [18] (methoxyfenozide) |
4 to 16 fl oz (0.06 to 0.25 lb ai/A) |
21-day wait for harvest. |
|
|
Karate w Zeon [3] (lambda-cyhalothrin) |
0.96 to 1.60 fl oz (0.015 to 0.025 lb ai/A) |
21 day wait for harvest or grazing. |
|
|
Mustang MAXX EC [3] (zeta-cypermethrin) |
1.76 to 4.0 fl oz (0.011 to 0.025 lb ai/A) |
7 day waiting period for harvest |
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
1.92 to 3.2 fl oz (0.0075 to 0.0125 lb ai/A) |
21-day waiting period. |
|
|
Pounce 25 WP |
3.2 to 6.4 oz |
30 day waiting period |
|
|
Radiant SC [5] (spinetoram) |
3.0 to 6.0 fl oz (0.023 to 0.047 lb ai/A) |
28-day wait for harvest, 3 days for forage or fodder. |
|
|
Sevin XLR [1A] (carbaryl) |
2 qt (1 lb ai/A) |
48-day wait for harvest: 14 days for grazing. |
|
|
Vantacor [28] |
1.2 to 2.5 fl oz |
14 day waiting period for harvest. |
|
|
Warrior II w Zeon [3] |
0.96 to 1.60 fl oz (0.015 to 0.025 lb ai/A) |
21-day wait for harvest. Check label for grazing restriction. |
White grub
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
White grub |
Seed Treatments |
|
|
|
Large, “C” shaped grub with a white body and a brown head. |
Cruiser 5FS [4A] (thiamethoxam) |
0.56 to 3.61 fl oz /80,000 seeds |
Do not use treated seed for feed, food, or oil processing. |
|
Damage: Feed on developing roots, cause slow growth, stunting, and stand loss. |
Poncho 600 [4A] (clothianidin) |
1.13 fl oz/80,000 seeds |
Do not use treated seed for feed, food, or oil processing. |
|
Threshold: No reliable thresholds are available. Consider using an at-planting treatment for “suppression” if field has a history of grub problems. |
Force ST [3] |
3 to 4 oz/cwt seed |
Do not use treated seed for feed, food, or oil processing. |
|
|
Planting Time |
|
|
|
|
Aztec 2.1 G [1B,3] (tebupiromphos, cyfluthrin) |
6.7 fl oz/1,000 ft-row |
Follow manufactures’ guidelines for rates, application methods grazing and crop rotation restrictions. Rotation of insecticides during successive years is suggested. |
|
|
Ballista LFC [3] (lambda-cyhalothrin) |
0.66 fl oz/1,000 ft-row |
T-band or in-furrow |
|
|
Counter 15G [1B] (terbufos) |
6 to 8 oz/1,000 ft-row |
T-band or in-furrow. |
|
|
Force 3G [3] (tebupiromphos, cyfluthrin) |
4 to 5 oz/1,000 ft-row |
|
|
|
Fortress 5G [1B] |
3.0 to 3.75 oz/1000 ft-row |
|
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
0.66 fl oz/1,000 ft-row |
|
Wireworm
| Pest, Damage and Treatment Threshold | Insecticide Formulation and [Group]* and (active ingredient) | Rate of Product per Acre or 1,000 ft-row | Comments |
|---|---|---|---|
|
Wireworm |
Seed Treatments |
|
|
|
Hard-shelled, smooth, cylindrical, yellowish to brown worms. 2- to 6-yearlife cycle. More common in corn planted into a sod or grass pasture. |
Cruiser 5FS [4A] (thiamethoxam) |
0.56 to 3.61 fl oz /80,000 seeds |
Do not use treated seed for feed, food, or oil processing. |
|
Damage: Feed on seed, seedling. Cause stunting and stand loss. |
Poncho 600 [4A] (clothianidin) |
1.13-2.36 fl oz/80,000 seeds |
Do not use treated seed for feed, food, or oil processing. |
|
Threshold: No reliable thresholds are available. Treat if field has a history of problems. Wireworms may be more of a problem in no-till or minimum till fields. |
Force ST [3] (tebupiromphos, cyfluthrin) |
3 to 4 oz/cwt seed |
Do not use treated seed for feed, food, or oil processing. |
|
|
Planting Time |
|
|
|
|
Aztec 2.1 G [1B,3] (tebupiromphos, cyfluthrin) |
6.7 fl oz/1,000 ft-row |
Follow manufactures’ guidelines for rates, application methods grazing and crop rotation restrictions. Rotation of insecticides during successive years is suggested. |
|
|
Ballista LFC [3] (lambda-cyhalothrin) |
0.66 fl oz/1,000 ft-row |
|
|
|
Capture 1.5 G [3] |
3.2 to 8 oz/1,000 ft-row |
|
|
|
Counter 15G [1B] (terbufos) |
6 to 8 oz/1,000 ft-row |
T-band or in-furrow. |
|
|
Force 3G [3] (tebupiromphos, cyfluthrin) |
4 to 5 oz/1,000 ft-row |
T-band or in-furrow. |
|
|
Fortress 5G [1B] |
3.0 to 3.75 oz/1000 ft-row |
|
|
|
Proaxis 0.5 SC [3] (gamma-cyhalothrin) |
0.66 fl oz/1,00 ft-row |
|
Pre-harvest Intervals and grazing restrictions
| Asana XL | 21-day PHI for harvest or grazing |
|---|---|
| Aztec 2.1G | Do not exceed 7.3 lb. per acre per crop season |
| Baythroid XL | 21-day waiting period for grain or fodder, 0 days for green forage |
| Besiege | 21-day waiting period for grain or fodder, 1 day for grazing |
| Blackhawk | 7-day wait for forage, 28 days for grain or fodder |
| Capture 2EC | 30-day PHI for harvest or grazing |
| Comite II | Apply in a minimum of 20 gal of water/acre ground, 3 gal by air |
| Counter 15G | Check label for precautions regarding application of Counter 15G and its interaction with ALS inhibiting herbicides. |
| Cruiser 5FS | No grazing restriction |
| Delta Gold | 21-day PHI for harvest, 12 days for forage or grazing |
| Dimethoate | Apply by aircraft. 14 day PHI for harvest or grazing |
| Fastac | 30-day PHI for harvest, 60 days for grazing |
| Force 3G | 30-day crop rotation restriction |
| Hero | 30-day PHI for grain and stover, 60 days for forage |
| Intrepid | 21-day PHI for harvest |
| Lannate | 21-day PHI for harvest, 3 days for forage |
| Mustang MAXX | 7-day PHI for harvest |
| Oberon | 5-day PHI for green forage, 30 days for grain or stover |
| Onager | 30-day PHI for harvest or grazing |
| Poncho | 45-day PHI for harvest or grazing |
| Portal | 14-day PHI |
| Pounce | 30-day PHI for grazing or harvest |
| Proaxis | 21-day PHI for harvest or grazing |
| Radiant | 28-day PHI for harvest, 3 days for fodder or forage |
| Sevin XLR | 14-day PHI for grazing, 48 days for harvest |
| Vantacor | 14-day PHI for harvest |
| Warrior II w Zeon | 21-day PHI for harvest |
| Zeal | 21-day PHI |
*MOA group numbers in brackets [#] following the insecticide name are used to designate the mode of action of the insecticide according to the classification system developed by the Insecticide Resistance Action Committee, (IRAC). It is intended to help in the selection of insecticides for preventative resistance management. If you make multiple applications for a specific pest during a growing season, simply select a registered insecticide with a different number for each application. To further delay resistance from developing, integrate other control methods into your pest management programs.
The pesticide information presented in this publication was current with federal and state regulations at the time of revision. READ and FOLLOW all LABEL directions.
Tom Royer
Extension Entomologist